package com.orifine.web;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

public class ValidateCodeImage {
	public BufferedImage image;
	public String code;
	
	public ValidateCodeImage(){
		genernateImage();
	}
	
	public void genernateImage(){
		int width = 60, height = 20;

		// 设置图片大小
		image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB); 
		Graphics gra = image.getGraphics();
		Random random = new Random();
		// 设置背景
		gra.setColor(getRandColor(200, 250)); 
		gra.fillRect(0, 0, width, height);
		// 设置字体
		gra.setColor(Color.black); 
		gra.setFont(mFont);
		
		//gra.setColor(new Color(0)); gra.drawRect(0,0,width-1,height-1);		 

		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测
		gra.setColor(getRandColor(160, 200));
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			gra.drawLine(x, y, x + xl, y + yl);
		}

		// 取随机产生的认证数字(4位数)
		code = "";
		for (int i = 0; i < 4; i++) {
			String rand = String.valueOf(random.nextInt(10));
			code += rand;
			// 将认证码显示到图象中
			// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生
			gra.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
			gra.drawString(rand, 13 * i + 6, 16);
		}
	}
	
	// 设置字体
	private static final Font mFont = new Font("Times New Roman", Font.PLAIN, 18);
	
	// 给定范围获得随机颜色
	private static Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
}
